Antifuse Contact Layout With Dummy Structures for Tight Spacing
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Solution Overview
Problem
As semiconductor devices shrink in size, the processing of antifuse devices becomes increasingly challenging due to the difficulty in forming features with smaller spacings, requiring improved antifuse devices and methods for effective fabrication.
Innovation Solution
The antifuse device design includes a first and second contact structure with acute angles and dummy structures in a substrate, where the contact structures are spaced and not electrically connected, with the dummy structures positioned to enhance the formation of a conductive link through material diffusion or electromigration when a programming current is applied, allowing for precise control and formation of a permanent conductive path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If semiconductor devices are shrunk in size, then device integration density is improved, but the processing difficulty and manufacturing precision of antifuse devices deteriorate due to smaller spacing between features
Solution Approach 1:
The method performs preliminary actions by forming dummy structures adjacent to the contact structures before forming the antifuse dielectric layer. These dummy structures pre-establish the spacing relationships and material distribution needed for subsequent processing, ensuring that when the antifuse layer is formed, the material can properly diffuse or migrate to create conductive links at the correct locations despite the reduced feature spacing.
Solution Approach 2:
The dummy structures serve as intermediary elements that facilitate the formation of conductive links between contact structures. By positioning dummy structures at specific spacings from contact structures, they mediate the material diffusion or electromigration process, enabling reliable conductive link formation in the reduced spacing environment of scaled-down devices.
2Volume of moving object
If spacing between contact structures is reduced, then device size is improved, but the reliability of conductive link formation deteriorates due to processing challenges
Solution Approach 1:
The method changes critical parameters by introducing dummy structures with specific spacing relationships to contact structures. The dummy structures are positioned at controlled distances (e.g., first spacing and second spacing as defined in the claims) from contact structures, which modifies the local material distribution and diffusion characteristics. This parameter adjustment ensures reliable conductive link formation even when the overall spacing between functional contact structures is reduced for device scaling.
Solution Approach 2:
The dummy structures are formed in advance to pre-establish the material pathways and spacing conditions needed for reliable conductive link formation. This preliminary action ensures that when programming voltage is applied, the material diffusion or electromigration process has the proper starting conditions to create reliable conductive links despite the reduced feature sizes.
3Manufacturing precision
If dummy structures are added to improve conductive link formation, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The method merges the formation of dummy structures with the existing contact structure fabrication process. The dummy structures are formed using the same patterning and deposition steps as the contact structures, integrating them into the existing manufacturing flow rather than adding separate process steps. This merging approach improves conductive link formation precision while minimizing the increase in device complexity.
Solution Approach 2:
The dummy structures serve multiple functions: they establish spacing references for antifuse layer formation, facilitate material diffusion pathways, and can be removed or retained based on design requirements. This multi-functionality allows a single structural addition to address multiple aspects of conductive link formation, improving manufacturing precision without proportionally increasing device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables the formation of a permanent conductive link between contact structures, facilitating the passage of electrical signals and addressing the challenges of miniaturization in semiconductor device processing.
Implementation Method 1
material diffusion
Implementation Method 2
electromigration
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
An antifuse device has a first contact structure and a second contact structure in a substrate. The first contact structure has a first contact side adjoining a second contact side and forming a first contact corner having an acute angle. The second contact structure is spaced from and not electrically connected to the first contact structure. The antifuse device further includes a first dummy structure in the substrate, adjacent to the first contact structure. The first dummy structure has a first dummy side nearest to and spaced from the first contact side of the first contact structure.